Whose Line Is It Anyway? (American TV series) season 15

The fifteenth season of the American television series Whose Line Is It Anyway? premiered on The CW on June 17, 2019, and concluded on September 23, 2019.

Main

 * Aisha Tyler
 * Ryan Stiles
 * Colin Mochrie
 * Wayne Brady

Recurring

 * Jonathan Mangum (three episodes)
 * Brad Sherwood (two episodes)
 * Greg Proops (two episodes)
 * Jeff Davis (two episodes)
 * Chip Esten (one episode)
 * Gary Anthony Williams (one episode)
 * Heather Anne Campbell (one episode)

Chip Esten, following two appearances as a special guest in seasons 13 and 14, returned as a recurring fourth performer for the first time since season eight.

Episodes
The "winner(s)" of each episode – as chosen by host Aisha Tyler – are highlighted in italics. The winner(s) perform a sketch during the credit roll, just like in the original UK series.